and add an xorg.conf file (otherwise the boot does not go to the end):

--- Code: ---# mcedit /etc/X11/xorg.conf--- Fin du code ---

and paste this in the newly created file:

--- Citer --- Section "Device"

Identifier "Intel GMA3600"

Driver "fbdev"

EndSection--- Fin de citation ---

then hit F2 to save, and F10 to quit.

The kernel being already a generic one and not a pae, it has not been necessary to change it. The lightdm login screen didn't need any configuration because it has been configured to boot straight to the desktop.